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Vpliv dodajanja kalijevega silikata na odpornost navadnega ječmena na sušo
ID Ojdanič, Nik (Author), ID Golob, Aleksandra (Mentor) More about this mentor... This link opens in a new window

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Abstract
Znano je, da sušni stres negativno vpliva na fiziološke in morfološke značilnosti rastlin. V raziskavi smo želeli preveriti, kakšen učinek ima suša na ječmen, in če gnojenje s silicijem v različnih rastnih fazah ublaži posledice suše. V raziskavi smo izvajali meritve na ječmenu, ki je bil izpostavljen suši in na ječmenu, ki je bil dobro zalit. Ječmen smo s silicijem tudi gnojili v treh različnih rastnih fazah, in sicer a) pred razvojem zgornjega lista, ki je nameščen pod klasom, b) od razvoja zgornjega lista, ki je nameščen pod klasom do začetka polnjenja semen in c) po začetku polnjenja semen. Izmerili smo fiziološke in biokemijske lastnosti ječmena, število trihomov spodnje in zgornje povrhnjice, optične lastnosti ter količino dostopnega silicija v tleh. Ugotovili smo, da je pomanjkanje vode negativno vplivalo na potencialno in dejansko fotokemično učinkovitost fotosistema II, prevodnost listnih rež, vsebnost fotosinteznih pigmentov in antocianov ter na odbojnost in presevnost. Gnojenje ječmena s silicijem ni zmanjšalo negativnih učinkov suše. Možno je, da je bilo v zemlji že dovolj silicija in zato nismo zaznali razlik med s silicijem gnojenim in ne-gnojenim ječmenom. Kljub temu smo zaznali razlike pri gnojenju s silicijem v različnih rastnih fazah. Gnojenje v drugi rastni fazi je povečalo odbojnost fotosintezno aktivnega dela svetlobnega spektra od površine listov ječmena v primerjavi z ječmenom gnojenim v prvi in tretji rastni fazi. Gnojenje v prvi rastni fazi je izboljšalo odbojnost listov ječmena v UV delu spektra.

Language:Slovenian
Keywords:Ječmen, gnojenje, silicij, suša
Work type:Master's thesis/paper
Organization:BF - Biotechnical Faculty
Year:2021
PID:20.500.12556/RUL-130185 This link opens in a new window
COBISS.SI-ID:77007619 This link opens in a new window
Publication date in RUL:11.09.2021
Views:1227
Downloads:283
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Secondary language

Language:English
Title:The effect of potassium silicate addition on drought resistance of barley
Abstract:
It is well known that drought-induced stress negatively impacts physiological and morphological properties of plants. In this study our aim was to determine the effects of drought on barley and if application of silicon fertilizer at different growth stages alleviates drought stress. Silicon was applied at three stages. Firstly, before the emergence of flag leaf. Then prior to the grain filling phase. Finally, at the start of the grain filling phase.We measured physiological and biochemichal properties, number of trichomes on the upper and lower epidermis, optical properties of barley and content of accessible silicon in soil. In this study it is shown that drought stress negatively impacts potential and effective photochemichal efficiency, stomatal conductance, content of photosynthethic pigments, content of anthocyanins and reflective and transmissive properties of barley leaves. Application of silicon fertilizer did not alleviate drought stress, however, differences in reflective properties were detected between application of silicon at different growth stages. Application of silicon between flag leaf emergence and filling of grains had a better effect on reflectance of photosynthetthically active radiation compared to the other two growth stages. Application of silicon before flag leaf emergence increased reflectance of UV radiation from barley leaves. It is also possible that the concentration of silicon in the soil was such that differences when adding additional silicon were negligible.

Keywords:Barley, fertilizer, silicon, drought

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